Unable to reinstall NIS

The [Agree & Install] link in the popup from setup.exe acts like plain text, not a link.  Would like some guidance B4 running another program downloaded in the attempt at reinstalling.  Details follow.

As of [2012-11-14], I had NIS installed on 3 computers. On one of them, NIS started asking me to press the [Fix Now] button. The request persisted despite a few iterations of pressing the button, running LiveUpdate, and rebooting. NIS insisted it could not fix several things, including SONAR and antispyware.

The virtual assistant "Nathan" recommended removing and reinstalling.  I downloaded the latest Norton Removal Tool and ran it.  The internet connection happened to go down briefly during removal; dunno whether that matters.  I also downloaded and ran the Norton Power Eraser, which found nothing to complain about.

Following the browser link that Nathan had provided for the reinstall, I logged into my Norton account and found that my NIS was still listed as installed on 3 computers.  I did not know whether this was what I should see, but pressing the [Download] button did work.  When I ran the downloaded setup.exe, it soon produced the popup asking me to click on [Agree & Install].  But clicking on the link had no effect.  The process just sat there generating page faults on Task Mgr w/o using any CPU.  The link to the license agreement did work, as did the link for going to the folder with downloaded files:

        C:\Documents and Settings\All Users\Documents\Norton\{NIS202019-SHPD-FSD31014}

I noticed that the downloaded files include one named

        NIS-UPGRADE-ESD-NoDefs-20-2-0-19-EN.exe

with 44.8 MB that appears to be NIS 20.2.0.19. I considered running it directly, but I would like some guidance from an actual person first.    Should it be run?  Should it be run with or w/o having setup.exe running?